Metallicity distribution of Omega Cen Red Giants based on the Stroemgren m1 metallicity index

Details Metallicity distribution of Omega Cen Red Giants based on the Stroemgren m1 metallicity index Metallicity distribution of Omega Cen Red Giants based on the Stroemgren m1 metallicity index

2007-02-05

arxiv.org/abs/astro-ph/0702120v1

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures. To appear in the Proceedings of IAU Symposium 241: "Stellar Populations as Building Blocks of Galaxies", 1

Scientific paper

10.1017/S1743921307007958

We adopted uvby Stroemgren photometry to investigate the metallicity distribution of Omega Cen Red Giant (RG) stars. We provided a new empirical calibration of the Stroemgren m1 = (v-b)-(b-y) metallicity index based on cluster stars. The new calibration has been applied to a sample of Omega Cen RGs. The shape of the estimated metallicity distribution is clearly asymmetric, with a sharp cut-off at low metallicities ([Fe/H] < -2.0) and a metal-rich tail up to [Fe/H] ~ 0.0. Two main metallicity peaks have been identified, around [Fe/H] ~ -1.9 and -1.3 dex, and a metal-rich shoulder at ~ 0.2 dex.

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